Electrode.



' No. 8%,144. PATENTED AUG. 18, 1908.]

H. PAULING.

ELEOTRODE.

APPLICATION FILED AUG. 13, 1906.

MWAWQ rnrirn snare renew are,

HARRY PAULING, or eELsENKIRon ii, GER ANY, assieuon. TO THE FIRM OFSALPETERSAURE-INDUSTRIE-GESELLSCHAFT, an. B. H., 0F GELSEN- KIROHEN,GERMAN Y.

nnnc'rnonn.

Patented Au 1a, 1908.

Application filed. August 13, 1906. Serial No. 830,386.

To all whom it may concern."

Be itknown that 1,. HARRY PAULING, a subject of the German Emperor, andresident of 84 Wilhelmstras'se, in Gelsenkirchen, in the Kingdom ofPrussia, German Empire, have invented certain new and usefulImprovements in'Electrodes, of which the folowing is a specification; Inthe application of electricity to-the treatment of gases containingoxygen, such as air, it has been found advanta eous to use bsecond-class conductors,'such as melted or liquefied metal-oxids, asmaterial from which to make the electrodes designed for efiecting theelectrical discharges. The practical application of this method,however, has been found to involve certain difiiculties and.disadvantages. are entirely formed o second-class conductors, thencu-rrentsof a high tension can: not be made use of, because the pointsof such electrodes rapidly vaporize under the Themetal-oxid thus formedcan no morevaporize, because the electrodes themselves,

' owing to the well-known fact that metal is a good conductor of heat,act to convey, from the points of the electrodes, the greatest part ofthe heat due to the action of the energy supplied to the electrodes.Such electrodes thus show the advantage possessedby electrodes made ofthe usual kind of metal, that is, a metal not capable of generating asecondclass conductor, inasmuch as they like these allow of theapplication of possessed of the advantageous qualities attributed tosecond-class conductors.-

In the practical application of the new electrodes may proceed asfollows: I bring the points of the electrodes into mutual con- Forexample, if the electrodes the 'pureness of tact, as is common with theusual metal electrodes, and leave them in this state until by.

the passage through of the current the pointsbecome incandescent.

ter oxidize owin to the oxy en contained in the gas to be su jected to te action of the discharges I I then separate the electrodes so as toform such a distance between their In this state. the lat-.

points that the voltaic arcs generated areof"v the desired length,current-strength, and ten-- .sion.

Electrodes of found to be of high practical value in connection withprocesses for producing, by elect'rical discharges, nitric acid ornitr1c oxid from air or another mixture of oxy enwith nitrogen, inasmuchas the-metal-oxi formed vaporizes in trifling quantities only, so thatthe nitric acid or nitric 'oxid produced is not affected. Such is thecase so much the moreas these-vaporized quantities of metal oxid arenot'soluble' in nitric acid,-

so that they may be "separatedtherefrom in any usual or desired manner.

- The accompanyingdrawingillustrates a form of construction adaptedfor'electrodes made according to this invention, Fi ure 1 being a frontelevation of a pair of we elec trodes and 2 a section op the line A B ofFi 1.

' 3, e are the electrodes and o denotesthe melted metal oxide originatedby the action of the nature described are the arcs f. The electrodes aresquare incross-section (Fig.2) and are at their points provided withcoolin --ri bs is formed inte a1.

therewith or secure suitable manner. p A The s uare cross-sectionalshape and a horizonta position of the electrodes prevent the meltedoxids from dri ping off from the electrodes, While the cooling ribs 7cact like thereto in any ot ier the electrodes themselves to convey theheat originated by the .e'riergysupplied to the electrodes, so astoYprevent the melted oxids from. vaporizing. t a 4 It is to beunderstood'that I do not desire to confine myself to aparticular sort orcomposition of metal from. which to make the new electrodes, but thatany suitable metal.

may be used within the scope indicated by the appended claim.

What is claimed is:

The herein described process forthe treatment of gases by are dlsch'ares, consisting in producing melted metal oxi at the points of theelectrodes made of a metal enerating the said melted oxids by the actionof' the energy supplied to the electrodes used for the production ,ofthe said arcs, and in maintaining such melted oxids in their liquidstate by the said arcs, substantially as set.

orth.

In Witness whereof I have hereunto signed my name this 23rd day of June1906, in the presence of two subscribing witnesses.

I] A RRY PAU LING.

Witnesses: f

HENRY ll Asrnn, W'OLDEMAR l-IAUPT.

